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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce12905d8413eca19204ee3071be3e3d3901e0aaf89934185a9591ddfb44867e' 
  AND token = 'hGgMmEqCn8aQe8EBrG08sl08aFlZkNXPL4WfWNoQUuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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