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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25d1bb914f2555a8b3e3a8333d3ca0af190453b031aef57c5da830d9330ae94' 
  AND token = 'XrfvRR1jyWgAhAbXtva0gxI6sNhaHTGs5UWHJSnslME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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