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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfbb7571c09a64a764a88a15698fc1a78e77ee9c5f668bfd77d1c4afb83b52a1' 
  AND token = '3U/BSp6dPdo/aFlg3iletpiQNImC7zHKt2pqmFJB15A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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