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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c8d3a6e7b858deca9429310836df640ce259cbf1faee0afc31bd86f95c95bb' 
  AND token = 'W+sm7x0WNPHW1lIJUr59Uec91P0Z1UBdy/ucoLlroUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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