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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e29e6c858217dc703e8c6c3154b1dc2c0c71b771c105a2ead6b8c62cf16f6a6' 
  AND token = '58MMTpuGsVMPWxUDj0+dHdkBHUi+7sqpuu76aN/Zov4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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