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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee78775c702ddfa61fd34d9727688caefa6190c763257eb453896b5a99ec3176' 
  AND token = 'UjBssN0rRzul5PxOPohB4N9/9BK/sTCLm6FzKZ7X2uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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