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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1da89dda5a9e86a53322ce262a0d306a07b3139fc13de84b7bbc3fde63d06b' 
  AND token = 'BLnvxPUt+Zsai61a1r0AIrgXZo5W9xW2DdUEMyb94zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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