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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc7997fc2a457d846b0fc39a3897a010a7f8ddf072b868a67a09abd048038c9' 
  AND token = 'AwdWfQhGjQhvdhUAqsu72ziiwOzUmC3XSoWzMzjvYao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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