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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd552ecc7ee4c7514db82076aa66c74246cc780d8e15e5f33a5c60a8d1381cf51' 
  AND token = 'Ai9DO1/fyh75+DZcII3BKU//xA7gBs/gbHtxyPOmzzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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