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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9fe1bfe3b4791a580749face69c2187e43f8fd0c4f510b9c2c8a580e8ccd16' 
  AND token = 'CLGCxX5Dl+UoaEYGW2J34oEg5BeP/bQZ0RyGh1qfXxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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