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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55faeccc2d792130e1c4adffc91e67bdc56be71c719024e5e2c94932c200d0b' 
  AND token = '7DFBxkGcZQJZiluP9TukryvvqM8qd9qSS8jjdEEstjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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