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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e7e39fef61ea57c54d0418e39bf5fc7232789ad79645ba185c1b8b8b83e4b1' 
  AND token = 'xAfJYKt/iR+E3FHpYzCegHmlHRkKpKeBv5H3XNczKtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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