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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33ac1116d7252bf1c9acfd882dba4e95edfe3acf721181af2ee876b6c181e748' 
  AND token = 'd3G0FFsvrfhyv+fydRbvt66yo5c8dxFdSXLBZge9c38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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