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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6608a57d10da3730ef1c156adf91d5e61a4332373948a181404369e806485b4' 
  AND token = '2/gCgUI0PKd70yr2GppiTfZ4wSJOPMQiYUaQkIHDnGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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