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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38da80e96871b2de511e4202c125f5b0519f9ae094d241c951e3d7c547f64897' 
  AND token = 'AR8YL4OtdS5R8ldPBNRs+ktDe886+DGJxk1k6gLo3jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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