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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a355075106a76f2b8674f91741b7aeebfefcb1891b740cc8785cdfbf3b6e6d0' 
  AND token = '5BIBv34l75c4zQa4X4OIyeK/1ZTLEBlCvsxzUF3iXDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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