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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060307cbc89de95c69b58e054acc3e2fc9adc27d920aa0088b6b669928d42ad5' 
  AND token = '6qlarVqbxnTp25W9ow9uX3VP9xSJ/4hFdNxi3E6D7so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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