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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9044a50a0d271ea65002bf574cb0d83cdb3f247746f41d4db1687709b15283c2' 
  AND token = 't99e1epuot2HCle8/DLzIhoVNPtFfTR191TSOkgCLi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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