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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3481c908e09e070bca1b9ac211ef820054b2ea65119cf3ea0b07bec90f44e43' 
  AND token = '2xpxvtBVHvB2PICpaqLhD20yjxNr7R9i/Vv4tr/d5bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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