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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc469f623f3383deca71d0ae5f3a6cdba98d80d639a5844fbb76d96b350f6ab' 
  AND token = 'uZ6qIRJhIHIe5B4rylL7GU5rFi9tGYwbI8treyshTUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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