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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab9ad34fe16c8dffdab5c364fae7a36f667020d32885b39c9af262d5a81038a' 
  AND token = 'xttjqwIlp79M3sGZ7/qDYbtOoMUimxVSRlEW0sv0HW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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