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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa769f5f287418ed121c80a169111f05987ea5513ab6dc99ee88272cba4c578a' 
  AND token = 'Q9Mki460j0Vn2B44m+WrbLfoav76q/LwoXM/JUU63iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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