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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ca77b350e4e910b4b8c3470e6d56cbb82843391f60669994682b6176ecffb2' 
  AND token = '3xHCg+NH5KZgMN/aUXSTCP84uMTO+xMy7YJZWgEiEiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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