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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5a69da90670f3ea33a16144dcd00811c2ea5905a73e287a2f1214615adbfab' 
  AND token = '3CPAvWudqfYjl3q3RGqmH7UTaYf6gRNIeS0o98vlyjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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