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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcbc4dbfb3f9e6d32aee2f1eaf92df8c2dce637d3d84c8a5a5cf640c7c05bcd1' 
  AND token = 'TasFe1fNmkW6XzHfpMoONH4Imnou3dRdpzrMJpMqojM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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