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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6dabb19d775f37a9c4039dcd5f51abf397b399ff6e013d9a97ea4138e53b84' 
  AND token = 'j3oOXbzJiKK/NrxZ67vIjxG284gEiekcaO3e7l4u2uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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