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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baade7bab6dd9fadd8618c7f506308b57152be7a8fb409a1715e0b9dbd403aac' 
  AND token = 'L81Gu5PZ247C3cdsiIdis/EanH6jLV0wOHMicy0tgZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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