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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c49126c70752249ab1e0e0aa4b620540082da9372c1caa9270f9d5ce6b7c09' 
  AND token = '6eM2n7pNRPVTet/Oi9Ej9Hf0XpsimHKRA+va5v7wmi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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