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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd403dcf2fbeaab4dd12fe7150064224abc6fc2915c8c088cb590fe85efc8fb57' 
  AND token = 'HEPh63+xMceMIZlDkH3NI6ccLuEPA3mnqvz4prmxeGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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