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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66836c936672b975c87e54b79bd63d211c78eb281e2cee829d62d6c34ac748ef' 
  AND token = '60OH+DX8exjeP2GCl0FJTacwUNowVbhyscjzWqLwLis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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