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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4793bbe2d0c16fde73510aa40de436a0a1692678c5d8707f79635d5afc7182e4' 
  AND token = '89FDTOGl6fLmuWzbGr14GlyAwIxhbsISuVsNKO6anQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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