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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8893f04685e8c0a7ea728e2c127f144245b3da55e3f333362e1b10d570bdf952' 
  AND token = 'tStQTfB7KYSXRj8uITJIdMY1FUXUzzxLQAsp5G4rJTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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