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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d6e877dd38a39e3902eb21a360796a061ca73d3d00134cdbc21b9a8ed17e3b' 
  AND token = 'wUwOe0KcJueg6R+EKDrY7Gz2ziBXMNAs8AHCNXfKtEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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