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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c3573e9fc0b3923c61ee4de93352512ce7a1448a79869a477745d353586694' 
  AND token = 'VUIpNsBghYnsg1NZ3TsP0u49rT53Qh5UQK2saAq9DPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}