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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f319949748278241b781064bb530f1a2d0c4e86eb79ca6cfc6298849177825' 
  AND token = 'DK7Xh6cnNokivJHqiofuYfJcJygQW24uirFsD8ELXpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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