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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cc8582d89deb28c55cb62629084251ed47aed9f3b27a3641beb936635189fb' 
  AND token = 'prEJKULbvm8bPu/L3j3p6WMkWJ7Oe1x39sohrrzMZ94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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