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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab060bacea8b3bbd1cca7c273ffd644f5d18c098ed656909d86c520c33f099a' 
  AND token = 'XtKUCVveIoxjyW1vOscqgQc9KW3jWR/yJzkNEK0r7DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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