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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435abc3e63feac1e67aba470c74b8230bac8199eb562dac7a2c14e921df7b9d1' 
  AND token = 'EOhtAOSx8hhCua171ZwWRg+WPjQSgUt6Jnti9xIVa7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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