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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be71336ce48288fdd0d9be73f8d4fdba67ded9ec18663caf98bd808f0225836' 
  AND token = 'bc+APw83Yu1IgUzuTgaSTRNU02P84OFuEKSGo14KNrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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