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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a3586dadf8d96bcbcb2923edf778fd0b8548c18e148bc06198b43e4d0ecee4' 
  AND token = 'Gjh9iUfj6vuub+VHSjyxN7PNT69DfTRgtDfaunHO48w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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