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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dacd936f570d16ae8f5ac780e77d1491793f6ef6f4d0bdff3c3f4b6ae20033fb' 
  AND token = 'ba75Fn6oc7CeXpFdc/LI5MCN3i/Jrq/xUp4ciF8iEmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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