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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeba312b2b17e5ebc76795fb8923f77b75c9aebdf9d19295de0f97e030caf6fc' 
  AND token = 'DbXOqL4ps4Co51OASx9p+L0yi/hUJO88mSiRQWwOYN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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