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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2ee44c56bcfd9676ebcb0ffa70133eab8e70fe9ed075f7d1a2e9b89f307a06' 
  AND token = 'FLIDrNYUUFj4fX31oEq6QU1wtcXZ5sGhzMtCF8fWcDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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