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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d88a4e244abea52ecb81c6f45c7d7c2131c0fbf715a8f7171f7eb1edf7b1cd4' 
  AND token = 'z0wRi419pEXbAVvb05ZoYt7BWf7LJAXVQGL2QO+af+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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