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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3731a302af5ea0bee2d92adf8552f775277a358754f922fa70b7c9ee7bb6a156' 
  AND token = 'YQSmMNlnJEMUcIuxSs1s28L6TJthWYYZqu/JqEA78mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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