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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8d6a308a85409058aa1f6eb3efa90d30791c1b6d0f5cb4da5aac5a886db993' 
  AND token = 'H77oZu9NHkt8+eOhs7Zh68suYK65ukemAG8lnQTZsfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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