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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc505f69ada28af8a4d256d60e348fcf2fbdbfd2666d594ce4428ec6ad513e9' 
  AND token = 'BV3Sw5+jT4VFIhCtXnqC0jzUd3yYXq0h5KCSrAs55A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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