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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285d95b9a121a94110bb68412865758ac5f85cd4a0ecabfd2154bd1903eb0a2e' 
  AND token = 'PVgl1uvMkR1ue1zQxaOIkV0MvPm/q18TEFQDTtk+m8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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