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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a29fe0e4ce0effe0e4ff5dc1aa28c9f3ea51bf9bf905651f891405bbe70cf7f' 
  AND token = 'VZjr2435Yxr1D71GatqNnq0+D6Vgcf0xws2lKT1xt7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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