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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a0224e6d6cb5dc534ad45bf31c4a6147908fd2e76bfd8abc515ff64d8b6bd6' 
  AND token = '754CUibtGU4eDPQ54U0406huC2HY1Jdzy64mVfk/3h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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