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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66df398fe00e682384645e633634230ccdef54c2c8718dceed1f20e1fabf98a7' 
  AND token = '6eHAaYAkJ5X0pgkcZPB4Rbgr7Z2vpQBmZwBOu5ITnbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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