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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cad862d8c3e8947b10a7a48c44d61a243044b7ce53faf7125d2440b2142be35' 
  AND token = 'RurId6x5mHsJLlEaBprYYrpNi0v7xPZ0AkMbIFdqFxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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