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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece20eb5dfcb95a75d528da9f657080c76bf4f14e2c764b5441d57a6df79f072' 
  AND token = 'j2TMM92QLUQt/+2cv0jrRkmJeN/PmzuwDfN07xpK/rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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