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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84898a6cf572f30d56d02f9db52ae94b7e5f93e0edb96038626145888a544168' 
  AND token = 'hnFiMOoUaW3x27VTB66KLw0NugB0NtEgxlbkOse3SFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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