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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07078c2af31dc36b9f4df3e9e07dec0b9c520f6a30d4be2f6d5c34ff538e8b02' 
  AND token = 'bMP6WmYYm7BEiK9eZfCWnduPtJ+cfrq3rwXsgQFA+40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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