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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d0c268b26369f0a6e365972dbf82954324794546781a0eb77dc537103253457' 
  AND token = 'hLeVzKc9yTYptzr2P3uHRCn9v02FZUAN43eXnCkngtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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