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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb86f17557efe7be988a0286d19dcde1d2044f03aa93cc5bac5e72e81094a3a4' 
  AND token = 'fc317zJ5PAFlDIHeESXnop43WpIMIWhRv5dBkgixtKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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