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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d010f919631b64f19e21e9ca991a8fb7cd2c7558aa76d817eb1e63887e762d' 
  AND token = 'iVd2+QgDtHbLqkEOEw6nIuF7HzpN3hpyktobpKdYG+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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