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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8ef74e58122cbf74581761d08219cd735e9fd6843f6d3ef28c5bd7110d1e70' 
  AND token = 'bISHfvmLDKMMnOJ9rAItkh4UPgJNQgl9s5amkOY5fxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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