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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '667089e9a3b2ee12472f2b3a08cf1369d26a7da0add6c3370ebfb01ff5aefd41' 
  AND token = 'nVv8uGmRMsyltM5oglODHp7HTZ/ikiC2X+hR9WOscz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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