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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7beeabf3531461ae9c76a3b450912a907cd53d53c8bb1ef102221c66275207d' 
  AND token = 'dAIcRpV2qf/l0DrqCxioxHt8V7FMQmQM9RQ2hEF/CgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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