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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c13ccf3d82eb0867cb5825cfb07e6cda12ccec5fa4db0f042ea6b38eef72de9' 
  AND token = 'anSRfSxZ4NbHX4kg7y5rolslkY/NN1tFXQkN9ISzZcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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