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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba53b0636a4306773fdec2ea794b2eb68c036399b2eb835536b40db35f431f5' 
  AND token = 'EgqvphW0gKmDvEHkP3W7axbOFXxhduaBj2FTlZcE03o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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